JPH11303806A - Operation valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an operation valve device in which a piping for pump is not crossed with a piping for running. SOLUTION: In an operation valve device for piling plural hydraulic pumps 6, 8, a first operation valve for supplying a delivered pressure oil from a first hydraulic pump 6 to a first actuator, a second operation valve for supplying the delivered pressure oil from a second hydraulic pump 8 to a second actuator, a third operation valve for supplying the delivered pressure oil from the second hydraulic pump 8 to a third actuator and a join/separate valve 1 for communicating/intercepting the delivery route 7 of the first hydraulic pump 6 and the delivery route 9 of the second hydraulic pump 8 and joining with a car body 31, the first/second operation valves for the first/second actuators are piled and arranged to one side of the join/separate valve 1 and the other operation valve is piled and arranged to the other side of the join/separate valve 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation valve device for operating each hydraulic actuator of a hydraulically driven working vehicle such as a hydraulically driven bulldozer or hydraulic excavator.

[0002]

2. Description of the Related Art In the above-mentioned hydraulically driven work vehicle, for example, a hydraulic traveling bulldozer and a hydraulic shovel are provided with a hydraulic cylinder and a swing motor for driving a plurality of working machines, and left and right traveling hydraulic motors. Various hydraulic systems have been proposed in which hydraulic oil is supplied to working hydraulic actuators such as a plurality of hydraulic cylinders and swing motors and left and right traveling hydraulic motors in a circuit configuration using a plurality of hydraulic pumps.

[0003] For example, a hydraulic system proposed in Japanese Patent Publication No. 7-92090 discloses a hydraulic motor for driving a left hydraulic motor through a left operating valve and a working valve for discharging hydraulic oil from a first hydraulic pump. And some of the working hydraulic actuators, and the discharge hydraulic oil of the second hydraulic pump is supplied to the right running hydraulic motor and the remaining working hydraulic actuators via the right running operating valve and the working operating valve. It has become. Further, the discharge pressure oils of the first and second hydraulic pumps are merged and separated by a merge / diverge valve.

In the above-mentioned hydraulic system, by switching the merge / shunt valve, the discharge pressure oil of the first hydraulic pump and the discharge pressure oil of the second hydraulic pump are merged, so that the left and right traveling hydraulic motors and the respective hydraulic actuators are operated. To supply. When the discharge pressure oils of both hydraulic pumps are made independent, the discharge pressure oil of one hydraulic pump travels to the left traveling hydraulic motor and working hydraulic actuator, and the discharge pressure oil of the other hydraulic pump travels to the right. To the working hydraulic motor and the remaining working hydraulic actuator.

[0005] Each of the operation valves and the junction valve used in the above-mentioned conventional hydraulic system has a structure in which a spool for switching the opening and closing of each port is slidably fitted in a valve body having a plurality of ports. Each operation valve and the junction valve are stacked and connected to each other to form an operation valve device called a so-called multiple valve. The operating valve device is shown in FIG.
As shown in the figure, the junction valve 100 is arranged in the middle, the operation valve 101 for operation and the operation valve 102 for left traveling are sequentially laminated on one side (upper side), and the remaining operation valve is arranged on the other side (lower side). The operating valve 103 for right and the operating valve 104 for right running are sequentially laminated and attached to the vehicle body side. Left and right traveling control valve 1
02 and 104 are hydraulic pipes 105A and 105B for traveling hydraulic motors connected to the left and right hydraulic motors for traveling, and hydraulic actuators for working equipment are connected to the operating valves 101 and 103 and hydraulic actuators for each working. Piping 10
6 and 106, and a pump pipe 107 connected to a hydraulic pump is connected to the junction valve 100, respectively.

[0006]

In the above-mentioned conventional operation valve device, the left and right traveling operation valves 102, whose pipes are connected to the left and right traveling hydraulic motors arranged on the lower side of the vehicle body,
104 are arranged on both outer sides in the vertical direction of the operation valve device. Therefore, one traveling operation valve 10 arranged on the upper side
2, the traveling hydraulic motor pipe 105A crosses the other pipes 106, 107 extending in the front-rear direction of the vehicle body with the other valves 100, 101, 103, and thus the traveling hydraulic motor pipe. The handling of 105A was bad.

The present invention has been made in view of the above, and it is possible to arrange a traveling pipe connected to a valve body of a traveling operation valve without crossing each valve body of a diverter valve and other operation valves. It is an object of the present invention to provide an operation valve device capable of simplifying a pump pipe and a valve configuration.

[0008]

In order to achieve the above object, an operation valve device according to a first aspect of the present invention comprises a plurality of hydraulic pumps 6, 8 and a discharge from the first hydraulic pump 6. A first operating valve for supplying hydraulic oil to the first actuator, a second operating valve for supplying hydraulic oil discharged from the second hydraulic pump 8 to the second actuator, and a second hydraulic pump 8 A third operating valve for supplying the discharge pressure oil to the third actuator, and a junction valve 1 for communicating and blocking the discharge path 7 of the first hydraulic pump 6 and the discharge path 9 of the second hydraulic pump 8. Of the operating valve devices that are stacked and connected to each other
The first and second operation valves for the second actuator are stacked and arranged on one side of the junction valve 1, and the other operation valves are arranged and stacked on the other side of the junction valve 1.

According to the first aspect of the present invention, the left and right hydraulic fluid motors for supplying hydraulic oil to the left and right traveling hydraulic motors arranged on one side, for example, below the vehicle body to which the operating valve apparatus is connected. By disposing the traveling operation valves 2 and 3 below the junction valve 1, the traveling pipe 32 connected to the valve bodies of the operation valves 2 and 3 is connected to the respective valves of the junction valve 1 and other operation valves. The right and left traveling hydraulic motors 11 and 12 can be arranged without crossing the main body, so that the pipes do not cross each other and the pipes can be easily handled.

[0010] The operation valve device according to the second aspect of the present invention includes the above-mentioned first valve device.
In the operation valve device according to the present invention, of the first and second operation valves stacked and arranged on one side of the merge / divide valve 1, the merge / divide valve 1
Pump port 1 for supplying discharge pressure oil from the second hydraulic pump 8 to the second operation valve to the first operation valve closer to
0 is provided. In the configuration of the operation valve device according to the second invention, the external piping from the second hydraulic pump 8 to the pump port of the second operation valve can be omitted,
The pump piping can be simplified.

The operating valve device according to a third aspect of the present invention provides the operating valve device according to the first aspect.
In the operating valve device according to the invention, the first operating valve and the second operating valve
Are configured to have the same configuration, and the operation valves can be shared.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a circuit diagram of a hydraulic system according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a merging / shunting valve, 2 denotes a left traveling operation valve, 3 denotes a right traveling operation valve, and 4 and 5 denote working machine operation valves. For example, 4 is a blade operating valve, and 5 is a tilt operating valve. The left and right traveling operation valves 2 and 3 are combined branch valves 1
Is arranged on one side (left side in the figure). A blade operation valve 4 and a tilt operation valve 5 which are operation valves for a working machine are arranged on the other side (the right side in the figure).

The discharge path 7 of the first hydraulic pump 6 is connected to the pump port 3A of the right traveling operation valve 4. The discharge path 9 of the second hydraulic pump 8 is connected to the respective pump ports 4A and 5A of the blade operation valve 4 and the tilt operation valve 5. Further, the discharge passage 9 of the second hydraulic pump 8 is connected to the pump port 2A of the left traveling operation valve 2 via a pump passage 10 provided in the right traveling operation valve 3.

The left traveling hydraulic motor 11 is connected to the first and second actuator ports 2D, 2E of the left traveling operation valve 2. The right traveling hydraulic motor 12 is connected to the first and second actuator ports 3D and 3E of the right traveling operation valve 3. The blade cylinder 13 is connected to the first and second actuator ports 4D, 4D of the blade operation valve 4.
Connected to E. Further, the tilt cylinder 14 is connected to the first and second actuator ports 5 of the tilt operation valve 5.
D, 5E.

Each of the operation valves 2, 3, 4, and 5 is located at a neutral position A and on both sides of the neutral position A, respectively.
It has first and second positions B and C which are reverse passages, and is always held at the neutral position A. First pressure receiving part 2
When the pilot pressure is applied to B, 3B, 4B, and 5B, the position is switched to the first position B. Also, the second pressure receiving units 2C, 3
The position is switched to the second position C by the pilot pressure acting on C, 4C and 5C. Thereby, each of the first and second actuator ports 2D, 2E, 3D, 3E, 4
Pressure oil is supplied from one of D, 4E, 5D, and 5E to the left and right traveling hydraulic motors 11, 12, the blade cylinder 13, and the tilt cylinder 14.

The junction valve 1 is provided at a junction position D where the discharge path 7 of the first hydraulic pump 6 and the discharge path 9 of the second hydraulic pump 8 communicate with each other.
And a separation position E for shutting off. Spring 15
Position D with the pilot pressure acting on the first pressure receiving portion 1A
Is to be held. The separation position E is set by the pilot pressure acting on the second pressure receiving portion 1B.

FIG. 2 shows the above-mentioned merging / joining valve 1 and the respective operating valves 2 to 2.
FIG. 5 is a circuit diagram showing a pilot pressure switching device for selectively applying a pilot pressure to each pressure receiving portion and switching the pilot pressure. In the figure, reference numeral 20 denotes a left traveling hydraulic pilot valve. By switching the left traveling hydraulic pilot valve 20, the first and second pressure receiving sections 2B, 2B of the left traveling operation valve 2 are switched.
The pilot pressure is applied to one of the valves 2C to switch the operation valve 2. The pilot pressure at this time is detected by the first shuttle valve 21.
Reference numeral 22 denotes a right traveling hydraulic pilot valve. By switching the right traveling hydraulic pilot valve 22,
A pilot pressure is applied to one of the first and second pressure receiving portions 3B and 3C of the right traveling operation valve 3, and the operation valve 3 is switched. The pilot pressure at this time is detected by the second shuttle valve 23. The pilot pressure detected by the first and second shuttle valves 21 and 23 is guided to the third shuttle valve 24, and the higher of the two pilot pressures is applied to the second pressure receiving portion 1 </ b> B of the junction valve 1. Is to be acted upon.

Reference numeral 25 denotes a hydraulic pilot valve for the blade. By switching the hydraulic pilot valve 25 for the blade, the first and second pressure receiving portions 4 of the operating valve 4 for the blade are switched.
A pilot pressure is applied to one of B and 4C to switch the operation valve 4. The pilot pressure at this time is detected by the fourth shuttle 26. Reference numeral 27 denotes a hydraulic pilot valve for tilt. By switching the tilt hydraulic pilot valve 27, the first and second pressure receiving portions 5B, 5B of the tilt operation valve 5 are switched.
The pilot pressure is applied to one of C and the tilt operation valve 5 is switched. The pilot pressure at this time is detected by the fifth shuttle valve 28.
The pilot pressure detected by the fourth and fifth shuttle valves 26 and 28 is guided to the sixth shuttle valve 29, and the higher of the two pilot pressures is applied to the first pressure receiving portion 1 </ b> A of the merge / shunt valve 1. Is to be acted upon.

In the above configuration, one or both of the left and right traveling hydraulic pilot valves 20 and 22 are operated to switch one or both of the left and right traveling operation valves 2 and 3 so that the left and right traveling hydraulic pilot valves 20 and 22 are switched. When the vehicle is driven by driving one or both of the motors 11 and 12, pilot pressure acts on the second pressure receiving portion 1 </ b> B of the merge / shunt valve 1 to be in the separation position E, and the first and second hydraulic pumps 6 and 8 are driven. Is supplied independently to the left and right traveling hydraulic motors 11 and 12.

By operating one or both of the blade hydraulic pilot valve 25 and the tilt hydraulic pilot valve 27, and switching one or both of the blade operating valve 4 and the tilt operating valve 5, the blade cylinder 13 is operated. When one or both of the tilt operation cylinders 14 are operated to operate, the pilot pressure acts on the first pressure receiving portion 1A of the merge / shunt valve 1, and the pilot pressure becomes the merge position D, and the first and second hydraulic pumps 6 and 8 discharge oils merge and blade cylinder 1
3. It is supplied to the tilt cylinder 14.

The left and right traveling hydraulic pilot valves 2
0, 22 and hydraulic pilot valves 25, 27 for each working machine
Are operated at the same time to perform traveling and work machine operation at the same time, since the pilot pressure acts on both the first and second pressure receiving portions 1A and 1B of the merge / branch valve 1, the merge / branch valve at this time 1 is brought to the merging position D by the urging force of the spring 15.

In the above embodiment, a pressure switch is used instead of the shuttle valve, a detection signal is input to the controller, and the controller opens and closes the electromagnetic on-off valve to open and close the first and second pressure receiving portions of the merge / shunt valve 1. Pilot pressure may be applied to 1A and 1B to switch the junction valve 1 in the same manner as described above.

When each of the operation valves is switched using an electric lever device for outputting an electric signal corresponding to the operation amount and an electromagnetic proportional pressure control valve, the electric signal of the electric lever device is inputted to the controller, The solenoid valve may be opened and closed to supply the pressure oil to the first and second pressure receiving portions 1A and 1B of the merging valve 1 to switch the merging / dividing valve 1 in the same manner as described above.

FIG. 3 shows an operation valve device. Each operating valve 2-5
The junction valve 1 is a valve body in which a spool is slidably fitted into a valve body, and the valve bodies are connected in a vertically overlapping manner. Specifically, a valve main body 30C of the right traveling operation valve 3 and a valve main body 30B of the left traveling operation valve 2 are sequentially superimposed on the lower surface (one surface) of the valve main body 30A of the junction valve 1. The valve body 30D of the blade operating valve 4 and the valve body 30E of the tilt operating valve 5 are provided on the upper surface (the other surface) of the valve body 30A of the merge / shunt valve 1.
Are sequentially superimposed and connected. The left traveling control valve 2 is vertically attached to the vehicle body 31 so as to be at the lowest position. The right travel operation valve 3 is provided with two pump ports. One is for the right and the other is for the left. The port for the left is the external piping 1 of another example of the circuit diagram of the hydraulic system shown in FIG.
0 'may be used.
Alternatively, a method of always communicating through a spool may be used.

The valve body 3 of the left and right traveling operation valves 2 and 3
0B, 30C first and second actuator ports 2D,
Traveling pipes 32 are connected to 3D, 2E, and 3E, respectively. The traveling pipe 32 is disposed toward the lower part of the vehicle body 31. Because of this, as shown in FIG.
The pipes to the left and right traveling hydraulic motors 11 and 12 attached to the lower rear of the vehicle 1 are simplified. Further, the pipes 32, 32 to the left and right traveling hydraulic motors 11, 12 do not intersect with the tilt and blade pipes connected to the other operation valves 4, 5.

The first and second pump pipes 3D are connected to the first and second pump ports 1D and 1E of the valve main body 30A of the merge / branch valve 1.
3, 34 are connected, and the first and second pump pipings are 3
Reference numerals 3 and 34 denote respective discharge ports of the first and second hydraulic pumps 6 and 8 which are disposed in the lateral direction and are mounted near the upper front part of the vehicle body 31 of the hydraulically driven bulldozer schematically shown in FIG. It is connected to the. Because of this, the first and second pump pipes 33 and 34 and the travel pipe 32 do not intersect as shown in FIG.

Working pipes 35, 35 are connected to the first and second actuator ports 4D, 5D, 4E, 5E of the valve bodies 30D, 30E of the blade operating valve 4 and the tilt operating valve 5, respectively. The working pipes 35, 35 are disposed toward the front of the vehicle body 31 and are connected to the blade cylinder 13 and the tilt cylinder 14 which are disposed on the front side of the vehicle body of the hydraulically driven bulldozer schematically shown in FIG. It is connected.

As described above, the operating valve device is used in a hydraulically driven bulldozer. An operation valve device is mounted vertically in an engine room 40 near the front of the vehicle body 31. The first and second hydraulic pumps 6 and 8 are driven by the engine 41. The left and right traveling hydraulic motors 11 and 12 are connected to the left and right crawler tracks 4.
2 is rotationally driven. The blade cylinder 13 swings a blade arm 44 having a blade 43 up and down, and the tilt cylinder 14 swings the blade 43 with respect to the blade arm 44.

Although the above embodiment has been described with respect to a hydraulically driven bulldozer, it may be used as an operating valve device of a hydraulic shovel. In this case, the valve bodies of the left and right traveling hydraulic motors are sequentially superimposed on one surface of the valve body of the merge / branch valve, and the boom operation valve, the arm operation valve, The valve bodies such as the bucket operation valve and the turning operation valve may be sequentially overlapped and connected.

The operating valve device is not limited to a vertical orientation, but may be mounted in any orientation, such as a horizontal orientation. Further, the first hydraulic pump 6 and the second hydraulic pump 8 may be two independent hydraulic pumps, or an integrated hydraulic pump having two discharge ports with one hydraulic pump, for example, as shown in FIG.
The flowway type piston pump 50 may be used. With this two-way way piston pump 50, the equipment configuration is simple and the actual volume can be small.

In the embodiment shown in FIG. 1, the right and left traveling operation valves 2 and 3 are connected to the right traveling operation valve 3 which is closer to the junction valve 1 and the hydraulic oil from the junction valve 1 is supplied to the right traveling operation valve 3. In the example shown in FIG. 6, the pump passage 10 for flowing the oil directly to the left traveling operation valve 2 is provided in the valve main body, but the pump passage 10 is, as in the other circuits of the hydraulic system shown in FIG. The discharge passage 9 of the second hydraulic pump 8 may be connected to the pump port 2A of the left traveling operation valve 2 by using an external pipe 10 'outside the right traveling operation valve 3. Thereby, the configuration of the right traveling control valve 3 becomes the same as each of the other control valves 2, 4, and 5, and the components can be shared.

FIG. 7 schematically shows a specific example of the common operation valves 2 to 5 used in the operation valve device using the external piping 10 'shown in FIG. A spool 61 having small-diameter portions 62A, 62B on both sides in the axial direction of the central shaft portion 60 is selectively applied with pilot pressure to pressure-receiving portions 2B to 5B, 2C to 5C provided on both sides in the axial direction, and moves in the axial direction. As a result, the pump port 2 is formed by the small diameter portions 62A and 62B.
A to 5A are selectively connected to the first or second actuator ports 2D to 5D and 2E to 5E. 63A and 63B are tank ports. Each of the tank ports 63A and 63B penetrates the valve body to form a skewer passage, which communicates with each of the operation valves. The outermost one of the valve bodies is closed with a stopper, and the other is closed. The valve body is connected to the tank and the pump side.

In the embodiment shown in FIG. 1, the left and right traveling operation valves 2 and 3 are configured such that one (right) operation valve communicates with the pump port of the other (left) operation valve. The configuration of the two is different in that the passage 10 is provided. However, the two operation valves 2 and 3 may be shared by the configuration having the pump passage 10.

FIG. 8 schematically shows the structure of an operating valve device when two operating valves are used in common. Merging valve 1
1 has the same configuration as that of the embodiment shown in FIG. 1 and is connected to a right traveling operation valve 3 having a pump passage 10 penetrating through a valve body, and has the same configuration as the right traveling operation valve 3. The left operating valve 2 ′ is connected via an auxiliary plate 70. Then, the right traveling operation valve 3 is attached to the auxiliary plate 70.
An auxiliary passage 71 for communicating the outlet of the pump passage 10 with the pump port 2A of the left traveling operation valve 2 'is provided in a crank shape.

FIG. 9 shows another example of an operating valve device in which two operating valves are shared. In the auxiliary passage 71, one of the L-shaped passages 71 </ b> A may be formed in a groove shape on a side surface of the auxiliary plate 70. In this case, one end of the pump passage 10 provided in the left traveling operation valve 2 ′ communicates with the groove-shaped passage 71 A, and the other end of the pump passage 10 is closed by the stopper 72.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a hydraulic system showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a pilot pressure switching device.

FIG. 3 is a front view of the operation valve device.

FIG. 4 is a schematic explanatory view of a hydraulically driven bulldozer.

FIG. 5 is an explanatory view of a two-flow way piston pump.

FIG. 6 is another example of the configuration shown in FIG. 1;

7 is a cross-sectional view schematically showing a specific example of the operation valve according to the embodiment shown in FIG.

FIG. 8 is a schematic structural explanatory view of an operating valve device when two operating valves are shared.

FIG. 9 is another example of the configuration shown in FIG. 8;

FIG. 10 is a front view showing an example of a conventional operation valve device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Junction valve 2, 2 '... Left traveling operating valve 3 ... Right traveling operating valve 4 ... Blade operating valve 5 ... Tilt operating valve 6 ... 1st hydraulic pump 8 ... 2nd hydraulic pump 10 ... Pump passage 10 '... External piping 11 ... Left running hydraulic motor 12 ... Right running hydraulic motor 13 ... Blade cylinder 14 ... Tilt cylinder 20 ... Left running hydraulic pilot valve 22 ... Right running hydraulic pilot valve 25 ... Blade hydraulic Pilot valve 27 ... Hydraulic pilot valve for tilt 30 ... Valve body 31 ... Body 32 ... Piping for traveling 33 ... Piping for first pump 34 ... Piping for second pump 35 ... Piping for work 40 ... Engine room 41 ... Engine 42 ... Crawler track 43 ... Blade 44 ... Blade Arm 50 ... 2 Flowway Type Piston Pump 100 ... Combining Valve 101 ... Working Operating Valve 102 ... Left Traveling Operating Valve 1 3 ... the rest of the working operation valve 104 ... right travel operation valves 105A, 105B ... hydraulic actuators pipes 107 ... pipe pump pipes 106 ... working right traveling hydraulic motor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Naoki Ishizaki 400 Yokokura Nitta, Koyama City, Tochigi Prefecture Komatsu Manufacturing Co., Ltd.

Claims (3)

[Claims] A first operating valve for supplying hydraulic oil discharged from the first hydraulic pump to a first actuator; a second hydraulic pump; 8)
To supply the pressure oil discharged from the second actuator to the second actuator
An operation valve for supplying discharge pressure oil from a second hydraulic pump (8) to a third actuator;
Operating valve device for stacking and joining together a shunt valve (1) for communicating and blocking the discharge path (7) of the hydraulic pump (6) and the discharge path (9) of the second hydraulic pump (8). Of which
The first and second operation valves for the first and second actuators are stacked and arranged on one side of the junction valve (1), and the other operation valves are arranged and stacked on the other side of the junction valve (1). Operating valve device characterized. 2. A second hydraulic pressure is applied to a first operating valve, which is closer to the merging / shunting valve (1), of the first second operating valves stacked and arranged on one side of the merging / shunting valve (1). Pump port (10) for supplying discharge pressure oil from the pump (8) to the second operation valve
The operation valve device according to claim 1, further comprising: 3. The operating valve device according to claim 1, wherein both the first operating valve and the second operating valve have the same configuration.